The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Feb. 21, 1989
Filed:
Apr. 13, 1987
Shigeru Saitoh, Iwaki, JP;
Masaki Shimada, Iwaki, JP;
Kureha Kagaku Kogyo Kabushiki Kaisha, Tokyo, JP;
Abstract
An apparatus for purifying crystals comprises a crystal purifying tower having a transverse cross-section of two partially overlapping circles, stirrers each comprising a rotational shaft passing through the center of each of the circles and having blade members disposed spirally on its surface, a solid-liquid separation plate disposed at the bottom portion of the tower, a liquid take out means disposed below the separation plate, a starting crude crystal feed means disposed above the separation plate, a purified crystal take out means disposed at the upper portion of the tower, heating means disposed in the tower in a multistage manner along the longitudinal direction of the tower, and purified crystal circulation means for cooling a portion of purified crystals taken out from the tower and feeding back the cooled crystals to the tower at at least one portion of the tower.